"President Trump cannot and will not capitulate on his promise to secure the border," Graham, who has been leading negotiations to resolve the ongoing partial government shutdown, wrote on Twitter. "That includes walls and physical barriers where appropriate."

ADVERTISEMENT

"Shutdown continues. No end in sight," he added. The shutdown, which entered its 20th day on Thursday, is the second-longest in U.S. history.

President Trump cannot and will not capitulate on his promise to secure the border. That includes walls and physical barriers where appropriate.

Trump has been digging in on his demand for over $5 billion in border wall funding, while Democrats have offered $1.3 billion for border security measures — including reinforcement of existing walls and fences. Democratic leadership has opposed construction of any new physical barriers.

The president on Wednesday reportedly stormed out of a meeting at the White House to negotiate with Democratic leadership. On Thursday, Trump canceled his planned trip to the World Economic Forum in Davos, Switzerland, citing Democrats' "intransigence on Border Security."

“I think the meeting was a set-up so he could walk out,” Pelosi said on Thursday.

The longest government shutdown to date lasted 21 days between 1995 and 1996.